Larry,
My '37 had no seal at the axle pivot when I restored the truck and I left it that way. I finished the restoration in 2019 and have put just over 2K miles on it. I just went out to check with a flashlight and there is essentially no seepage of grease that I can see.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix